<template>
  <div class="box" ref="box">
    <div class="left">
      <!--左侧div内容-->
      asdads
    </div>
    <div class="resize" title="收缩侧边栏">⋮</div>
    <div class="mid">
      <!--右侧div内容-->
      asdasdadsasd
    </div>
  </div>
</template>

<script setup lang="ts">
import { onMounted } from 'vue'

const dragControllerDiv = function () {
  const resize = document.getElementsByClassName('resize')
  const left = document.getElementsByClassName('left')
  const mid = document.getElementsByClassName('mid')
  const box = document.getElementsByClassName('box')
  for (let i = 0; i < resize.length; i++) {
    // 鼠标按下事件
    resize[i].onmousedown = function (e) {
      //颜色改变提醒
      resize[i].style.background = '#818181'
      const startX = e.clientX
      resize[i].left = resize[i].offsetLeft
      // 鼠标拖动事件
      document.onmousemove = function (e) {
        const endX = e.clientX
        let moveLen = resize[i].left + (endX - startX) // （endx-startx）=移动的距离。resize[i].left+移动的距离=左边区域最后的宽度
        const maxT = box[i].clientWidth - resize[i].offsetWidth // 容器宽度 - 左边区域的宽度 = 右边区域的宽度

        if (moveLen < 32) moveLen = 32 // 左边区域的最小宽度为32px
        if (moveLen > maxT - 150) moveLen = maxT - 150 //右边区域最小宽度为150px

        resize[i].style.left = moveLen // 设置左侧区域的宽度

        for (let j = 0; j < left.length; j++) {
          left[j].style.width = moveLen + 'px'
          mid[j].style.width = box[i].clientWidth - moveLen - 10 + 'px'
        }
      }
      // 鼠标松开事件
      document.onmouseup = function (evt) {
        //颜色恢复
        resize[i].style.background = '#d6d6d6'
        document.onmousemove = null
        document.onmouseup = null
        resize[i].releaseCapture && resize[i].releaseCapture() //当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
      }
      resize[i].setCapture && resize[i].setCapture() //该函数在属于当前线程的指定窗口里设置鼠标捕获
      return false
    }
  }
}

onMounted(() => {
  dragControllerDiv()
})
</script>

<style scoped>
/* 拖拽相关样式 */
/*包围div样式*/
.box {
  width: 100%;
  height: 100%;
  margin: 1% 0px;
  overflow: hidden;
  box-shadow: -1px 9px 10px 3px rgba(0, 0, 0, 0.11);
}
/*左侧div样式*/
.left {
  width: calc(32% - 10px); /*左侧初始化宽度*/
  height: 100%;
  background: #ffffff;
  float: left;
}
/*拖拽区div样式*/
.resize {
  cursor: col-resize;
  float: left;
  position: relative;
  top: 45%;
  background-color: #d6d6d6;
  border-radius: 5px;
  margin-top: -10px;
  width: 10px;
  height: 50px;
  background-size: cover;
  background-position: center;
  /*z-index: 99999;*/
  font-size: 32px;
  color: white;
}
/*拖拽区鼠标悬停样式*/
.resize:hover {
  color: #444444;
}
/*右侧div'样式*/
.mid {
  float: left;
  width: 68%; /*右侧初始化宽度*/
  height: 100%;
  background: #fff;
  box-shadow: -1px 4px 5px 3px rgba(0, 0, 0, 0.11);
}
</style>
